<template>
  <div class="sidebar">
    <el-menu
      class="sidebar-el-menu"
      :default-active="onRoutes"
      :collapse="collapse"
      background-color="#324157"
      text-color="#bfcbd9"
      active-text-color="#20a0ff"
      unique-opened
      router
    >
      <template v-for="item in items">
        <template v-if="item.subMenuList.length != 0">
          <el-submenu :index="item.path" :key="item.path">
            <template slot="title">
              <i :class="item.icon"></i>
              <span slot="title">{{ item.name }}</span>
            </template>
            <template v-for="subItem in item.subMenuList">
              <el-submenu
                v-if="subItem.subMenuList"
                :index="subItem.path"
                :key="subItem.path"
              >
                <template slot="title"> {{ subItem.name }}</template>
                <el-menu-item
                  v-for="(threeItem, i) in subItem.subMenuList"
                  :key="i"
                  :index="threeItem.path"
                  ><i :class="threeItem.icon"></i>
                  <span slot="title">{{ threeItem.name }}</span></el-menu-item
                >
              </el-submenu>
              <el-menu-item v-else :index="subItem.path" :key="subItem.path">
                <i :class="subItem.icon"></i>
                <span slot="title">{{ subItem.name }}</span>
              </el-menu-item>
            </template>
          </el-submenu>
        </template>
        <template v-else>
          <el-menu-item :index="item.path" :key="item.path">
            <i :class="item.icon"></i>
            <span slot="title">{{ item.name }}</span>
          </el-menu-item>
        </template>
      </template>
    </el-menu>
  </div>
</template>

<script>
import bus from "../common/bus";
import { searchMenu } from "../../api/menu.js";
export default {
  data() {
    return {
      collapse: false,
      items: [],
    };
  },
  computed: {
    onRoutes() {
      return this.$route.path.replace("/", "");
    },
  },
  created() {
    // 通过 Event Bus 进行组件间通信，来折叠侧边栏
    bus.$on("collapse", (msg) => {
      this.collapse = msg;
      bus.$emit("collapse-content", msg);
    });

    // 获取token，发送到后端，根据角色，显示侧边菜单
    var token = localStorage.getItem("token");
    searchMenu(token)
      .then((result) => {
        if (result.status == "200") {
          this.items = result.data;
        }
      })
      .catch((err) => {});
  },
};
</script>

<style scoped>
.sidebar {
  display: block;
  position: absolute;
  left: 0;
  top: 70px;
  bottom: 0;
  overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
  width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
  width: 250px;
}
.sidebar > ul {
  height: 100%;
}
</style>
